<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      div {
        background-color: pink;
        border: 2px solid yellow;
      }

      #aside {
        float: left;
        border-top: 0px;
        border-bottom: 0px;
        width: 20%;
        height: 100%;
      }
      #section {
        border: 0px;
        float: left;
        width: 79%;
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div style="height: 100px">我的主页</div>
    <div style="height: 300px">
      <div id="aside">aside</div>
      <div id="section">section</div>
    </div>

    <div style="height: 100px">footer</div>
    <div style="width: 50px;height: 50px;background-color: aqua;position: fixed;top: 100px; right:100px ;border: 0px;"></div>
  </body>
</html>
